Within web3j, RLP encoding is used to encode Ethereum transaction objects into a byte array which
is signed before submission to the network. The transaction types and signing logic are located
within the Crypto module, with the
TransactionEncoderTest
providing examples of transaction signing and encoding.

This is a very lightweight module, with no other dependencies. The hope is that other
projects wishing to work with Ethereum’s RLP encoding on the JVM or Android will choose to make
use of this module rather then write their own implementations.